It’s late, I’m tired, I’m reasonably sure this how-to manual will make little to no sense in the light of day … but here it is. Please feel free to make suggestions on how we can improve our build. Hope this helps
Build your own Motherbox v1.pdf (5.2 MB)
Here is the Arduino sketch we’ve been using. There’s another version of it with some different functionality but that can wait for the light of day 
FMD sketch converted to Word.docx (30.0 KB)
Will try and figure out a better way of sharing this tomorrow, seeing as I can’t upload the .ino file format. Sorry about that.
